Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a615198b73efe01…

MALICIOUS

PDF

73.3 KB Created: 2021-05-02 06:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 06e36493bc7a87b503aa5e376f39c6be SHA-1: 74cbb4b57e409c5b51de7ca8122e7ab0caebe29a SHA-256: 6a615198b73efe0161381f777cc0da6d666fab9bc6ac4e2fd8790d387971fb04
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=coleman+fleetwood+pop+up+camper+reviews PDF link annotation
    • http://wetiludivarag.scienceontheweb.net/piwotibuz.pdfIn PDF document text
    • https://pomapufawupufus.weebly.com/uploads/1/3/5/3/135397804/fotabugikog-kekasujivabela-worozexikeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411700/normal_5fe33b5714077.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485807/normal_602f60570da0a.pdfIn PDF document text
    • https://voduzivesaduv.weebly.com/uploads/1/3/4/4/134456438/safobojikas.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/3668f3761630.pdfIn PDF document text
    • https://sukanoxe.weebly.com/uploads/1/3/1/4/131453950/surasulexuvodab-fubut-mikenunuma-gipatasuxakazew.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/45034624578.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/do_worms_have_9_lives.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485321/normal_5ff7f855d34a9.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/mugosan.pdfIn PDF document text
    • http://xipodijajul.sportsontheweb.net/metro_map_2020_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5fcf30f59ca58.pdfIn PDF document text
    • https://baxopaparoxiw.weebly.com/uploads/1/3/1/4/131454316/a455c18.pdfIn PDF document text
    • https://xubibedizu.weebly.com/uploads/1/3/1/4/131454459/fabibizuzuvazuz_zenipadila.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375350/normal_600335fc52410.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/wifirawiwiwazowavabig.pdfIn PDF document text
    • http://xepuzakudera.atwebpages.com/rogifofaxinokozunenibaner.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/arellano_university_malabon_uniform_senior_high.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/beneteau_first_25_performance.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 5360 bytes
SHA-256: 2ad226588d1babc14802ad2a64474fbf4fd29636cccf6559956bc652ec3103af
font_01_sfnt_off0000f423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF423 10416 bytes
SHA-256: a59ea249fd01726c13a3d842b20ec37509108fe01274ad08f2df4f785658a9e9

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